Linux disk space email alert

gistfile1.sh

#!/bin/bash
# www.fduran.com
# script that will send an email to EMAIL when disk use in partition PART is bigger than %MAX
# adapt these 3 parameters to your case
MAX=95
[email protected]
PART=sda1

USE=`df -h |grep $PART | awk '{ print $5 }' | cut -d'%' -f1`
if [ $USE -gt $MAX ]; then
  echo "Percent used: $USE" | mail -s "Running out of disk space" $EMAIL
fi

If you don't want to step up to a full monitoring solution such as Nagios you can create your own scripts for monitoring the things that you want to monitor, such as disk space. The following script alerts you when your root partition is almost full:

`

!/bin/bash

CURRENT=$(df / | grep / | awk '{ print $5}' | sed 's/%//g')
THRESHOLD=90

if [ "$CURRENT" -gt "$THRESHOLD" ] ; then
mail -s 'Disk Space Alert' [email protected] << EOF
Your root partition remaining free space is critically low. Used: $CURRENT%
EOF
fi
`
The script sends an email when the disk usage rises above the percentage specified by the THRESHOLD varialbe (90% here).

To run it daily, for example, save the script to the file sample.sh in your home directory, change the email to your email, and add the following line at the end of /etc/crontab file:

@daily ~/sample.sh